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Re: How loud is your valvetrain?
[Re: ahy]
#670669
04/16/10 08:39 PM
04/16/10 08:39 PM
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Joined: Dec 2004
Posts: 10,555
Rittman Ohio
fourgearsavoy
I Live Here
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I Live Here
Joined: Dec 2004
Posts: 10,555
Rittman Ohio
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I have a Comp XTQ series series FT unit with Isky iron rockers upgraded by RAS and it's pretty quiet  I have seen some engines with a hydraulic cam and adjustable rockers not adjusted tight enough  Gus 
64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60
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Re: How loud is your valvetrain?
[Re: Viol8r]
#670670
04/16/10 11:38 PM
04/16/10 11:38 PM
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Joined: Nov 2003
Posts: 3,438
Dandridge TN
Dabee
master
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master
Joined: Nov 2003
Posts: 3,438
Dandridge TN
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Quote:
All aluminum top end here with a new lunati Hyd. cam and its fairly noisy in a 11:1 440. I started at 3/4 turn and now up to 1 1/2 turns on the crane golds and its a little quieter and runs perfect.
Most say its the combo of aluminum parts and aggressive cam....not worried about it.
Same here. Comp cam, Indy EZ heads and rockers. 1.5 turns on rockers and still noisy. Over the past year I've had the valve covers off to many times to count and find no problems. It runs great, 11.7 ET at 119 mph with full interior, PS, PB and AC.
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Re: How loud is your valvetrain?
[Re: Dabee]
#670671
04/16/10 11:56 PM
04/16/10 11:56 PM
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Joined: Aug 2003
Posts: 43,228
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,228
Bend,OR USA
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Quote:
Quote:
All aluminum top end here with a new lunati Hyd. cam and its fairly noisy in a 11:1 440. I started at 3/4 turn and now up to 1 1/2 turns on the crane golds and its a little quieter and runs perfect.
Most say its the combo of aluminum parts and aggressive cam....not worried about it.
Same here. Comp cam, Indy EZ heads and rockers. 1.5 turns on rockers and still noisy. Over the past year I've had the valve covers off to many times to count and find no problems. It runs great, 11.7 ET at 119 mph with full interior, PS, PB and AC.
If your adjusters are 3/8 by 24 thread (fine threads) one complete turn equals .042, 1.5 turns would be .063 travel which is probally to much preload  I adjust the rocker preload with the motor warmed up, water and oil at least 140F, and start with 1/2 turn from zero and then go try it, adjust tighter and looser and find out what the motor really likes  . Some of the motors, street Hemi and NHRA stockers, I have had like 1/4 turn warm or hot at the track
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: How loud is your valvetrain?
[Re: dvw]
#670672
04/17/10 12:28 AM
04/17/10 12:28 AM
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Joined: Oct 2007
Posts: 4,209
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,209
New York
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You'd be surprised at how much noise a rocker makes when it whacks the stands on either side with even an extra .020" end-play. There are other things that make noise, and it may sound like it's coming from the top - like mechanical fuel pump eccentric, 1 bad link or tooth chip on the timing chain. Quite a few engines have been put together with valve covers too low, and a rocker bangs it - but only after you tighten the cover gasket a few times!  Yes, a hydro with the wrong pre-load will make noise also, and this is a function of oil pressure, viscosity, and tappet mfg.
Boffin Emeritus
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Re: How loud is your valvetrain?
[Re: Viol8r]
#670674
04/17/10 07:52 AM
04/17/10 07:52 AM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
All aluminum top end here with a new lunati Hyd. cam and its fairly noisy in a 11:1 440. I started at 3/4 turn and now up to 1 1/2 turns on the crane golds and its a little quieter and runs perfect.
Most say its the combo of aluminum parts and aggressive cam....not worried about it.
I don't understand all this talk about the "number of turns"?
On a hydralic cam the lash should be set when the motor is new and cold with the intake off. There's only a small area on the heal of the cam where there is no lift, that's when you set your pre load on the lifters. Each valve will be different and require different amount of "turns"
With the intake off you can see the plunger in the lifter go down, but you got to make sure your on the heal of the cam. Set it once and your done forever on a hydralic cam.
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